학술논문
Responses of grain zinc and nitrogen concentration to nitrogen fertilizer application in rice varieties with high-yielding low-grain zinc and low-yielding high grain zinc concentration.
Document Type
Article
Source
Subject
*RICE varieties
*BIOFORTIFICATION
*ZINC content of plants
*EFFECT of nitrogen fertilizers on plants
*COMPOSITION of rice
*NITROGEN content of grain
*RICE yields
*CROP management
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Language
ISSN
0032-079X
Abstract
Background and aims: Rice crop management for Zn biofortification should also benefit yield. This study established how grain Zn concentration and yield of rice varieties with a range of grain Zn concentration vary under different N-fertilizer applications. Methods: Rice varieties, the low-yield/high grain Zn varieties KPK and NR, the high-yield/medium grain Zn variety KDML105 and the high-yield/low grain Zn varieties CNT1 and RD21, were grown under field conditions with fertilizer rates of 60 and 120 kg N ha. Results: Increasing N rate increased grain Zn concentration and yield in the high-yield/low grain Zn varieties, but depressed grain Zn concentration and increased grain yield in the low-yield/high grain Zn varieties. On the other hand, it increased grain N in all five varieties. Grain Zn concentration was associated positively with yield and grain N concentration in low grain Zn concentration varieties, but negatively in high-grain Zn varieties. Conclusions: Nitrogen fertilizer increased grain Zn concentration and yield simultaneously in low-grain Zn varieties, but depressed grain Zn concentration, while boosting yield, in high-grain Zn varieties. [ABSTRACT FROM AUTHOR]